Phase-shift keying - Wikipedia
Phase-shift keying (PSK) is a digital modulation process which conveys data by changing (modulating) the phase of a constant frequency carrier wave. The modulation is accomplished by varying the sine and cosine inputs at a precise time. It is widely used for wireless LANs, RFID and Bluetooth communication.
Understanding Quadrature Phase Shift Keying (QPSK) …
2016年8月17日 · A QPSK system can use a baseband signal of the same frequency, yet it transmits two bits during each symbol period. Thus, its bandwidth efficiency is (ideally) higher by a factor of two. This technical brief covers the basic characteristics of a digital modulation scheme known as quadrature phase shift keying.
Quadrature Phase Shift Keying - Online Tutorials Library
The Quadrature Phase Shift Keying (QPSK) is a variation of BPSK, and it is also a Double Side Band Suppressed Carrier (DSBSC) modulation scheme, which sends two bits of digital information at a time, called as bigits.
Digital Phase Modulation: BPSK, QPSK, DQPSK
Offset QPSK, π/4-QPSK, and minimum shift keying are modulation schemes that mitigate the effects of high-slope symbol-to-symbol voltage changes. Differential QPSK uses the phase difference between adjacent symbols to avoid problems associated with a lack of phase synchronization between the transmitter and receiver.
基于MATLAB实现QPSK调制解调仿真(结果超详细) - CSDN博客
2024年8月29日 · 本文详细描述了基于MATLAB的QPSK调制解调过程，包括各个环节的时域波形变化、功率谱特性、眼图和星座图，以及不同信噪比下的误码率仿真。. 重点展示了从基带信号到接收端的完整流程。. 摘要由CSDN通过智能技术生成. 基于 MATLAB 的 QPSK调制 解调仿真 (包含 …
QPSK - Quadrature Phase Shift Keying - GaussianWaves
2010年10月19日 · Quadrature Phase Shift Keying (QPSK) is a form of phase modulation technique, in which two information bits (combined as one symbol) are modulated at once, selecting one of the four possible carrier phase shift states. Therefore, the four possible initial signal phases are \ (\pi/4, 3 \pi/4, 5 \pi/4\) and \ (7 \pi/4\) radians.
OptiSystem应用：100 Gbps DP QPSK - 知乎 - 知乎专栏
偏振复用和正交相移键控（pm-qpsk或dp-qpsk）的组合正在成为达到100 gbps或更高比特率的最有前景的解决方案之一。 在接收器端，数字信号处理（DSP）的使用导致相对于传统实现的显著部署改进。
QPSK Modulation-Quadrature Phase Shift Keying modulation
QPSK is bandwidth efficient as each signal point represents two bits. For example, instead of a phase shift of 180 degree, as allowed in BPSK, a common encoding technique, known as QPSK uses phase shifts of multiples of 90 degrees i.e. pi by 2. QPSK modulation can be represented mathematically as mentioned below.
QPSK | Analog Devices
Quadrature Phase Shift Keying (QPSK) is a form of Phase Shift Keying in which two bits are modulated at once, selecting one of four possible carrier phase shifts (0, 90, 180, or 270 degrees). QPSK allows the signal to carry twice as much information …
Implementation and performance analysis of QPSK system using …
2023年2月21日 · The Verilog models of the designed device are used to construct the leaf cells of quadrature phase shift keying (QPSK) system and the implemented QPSK system is taken as a key evaluator in...
- 某些结果已被删除